Roof cutting method and device for large-burial-depth mining roadway and computer readable storage medium

Abstract

The invention discloses a roof cutting method and device for a large-burial-depth mining roadway and a computer readable storage medium. The method comprises the following steps: in the process of mining a large-burial-depth mining roadway, carrying out stress monitoring and dynamic load monitoring on a top plate to obtain a monitoring result; under the condition that the monitoring result shows that the current stress of the top plate is higher than the stress threshold value and / or the current dynamic load of the top plate is higher than the dynamic load threshold value, the fracture position where the top plate is fractured is predicted through a fracture mechanical model based on the state parameters of the top plate; under the condition that the fracture position meets the preset roof cutting condition, a cutting strategy for cutting the roof is generated according to the fracture position; and the top cutting area in the top plate is cut off according to the cutting-off strategy, and the cut-off top plate reaches a stable state. According to the method and the device, the technical problems of relatively low accuracy and potential safety hazards caused by judgment on whether top cutting treatment needs to be carried out or not in a coal mining process and an operation method for carrying out top cutting generally depend on manual work in related technologies are solved.

Description

Technical Field

[0001] The present invention relates to the field of coal mine safety technology, and in particular to a method and device for cutting the top of a deep mining tunnel, and a computer-readable storage medium. Background Art

[0002] At present, many mining areas have begun to mine in depth. Different from shallow mining, the stress environment of the surrounding rock of deep mining tunnels is complex and prone to rock burst disasters, which seriously restricts the normal and safe production of coal mines. In the process of coal mining, roof management is an important link to ensure safe production. The stability and safety of the mining tunnel roof, especially the high-position weakly cemented roof of the deep mining tunnel, is directly related to the efficiency and safety of coal mine production due to the particularity of its environment, such as high stress, high humidity, and high temperature.

[0003] In the process of advancing the coal mine working face, the roof cutting and pressure relief technology is a commonly used roof treatment method, which can effectively improve the stress state of the roof and reduce the impact of the roof on the mining tunnel. However, in actual applications, not all roofs need to be cut. Some roofs have little impact on the working face due to geological conditions, lithological characteristics and other factors, and do not require pressure relief treatment; while some roofs have a greater impact on the working face due to their special structure and properties, and must be cut and pressure relieved.

[0004] In the above-mentioned related technologies, the judgment on whether to perform top cutting during coal mining and the operation method of top cutting usually rely on manual work, resulting in low accuracy and potential safety hazards. No effective solution has been proposed yet. Summary of the invention

[0005] The embodiments of the present invention provide a method and device for cutting the top of a deep mining tunnel, and a computer-readable storage medium, so as to at least solve the technical problems in the related art that the judgment on whether to perform top cutting during coal mining and the method for performing top cutting usually rely on manual operation, resulting in low accuracy and safety hazards.

[0006] According to one aspect of an embodiment of the present invention, a method for cutting the roof of a deep mining tunnel is provided, comprising: in the process of mining the deep mining tunnel, stress monitoring and dynamic load monitoring are performed on the roof of the deep mining tunnel to obtain monitoring results, wherein the deep mining tunnel refers to a tunnel with a burial depth greater than a depth threshold; when the monitoring results indicate that the current stress of the roof is higher than the stress threshold and / or the current dynamic load of the roof is higher than the dynamic load threshold, a fracture position of the roof is predicted based on the state parameters of the roof using a fracture mechanics model, wherein , the state parameter represents the current deformation degree of the top plate, the fracture mechanics model refers to a model that uses the principles of engineering mechanics to analyze the mechanical behavior of the fracture of the top plate; when the fracture position meets the preset cutting-top condition, a cutting strategy for cutting the top plate is generated according to the fracture position; the cutting-top area in the top plate is cut according to the cutting-top strategy, so that the top plate reaches a stable state after cutting, wherein the stable state refers to a state in which the current stress of the top plate is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold.

[0007] Optionally, when the monitoring result indicates that the current stress of the top plate is higher than the stress threshold and / or the current dynamic load of the top plate is higher than the dynamic load threshold, the fracture position of the top plate is predicted based on the state parameters of the top plate using a fracture mechanics model, including: analyzing the bending moment at each position in the top plate using the fracture mechanics model based on the state parameters of the top plate to obtain an analysis result, wherein the bending moment refers to the moment that produces bending deformation at any position in the rock formation of the top plate; determining the position of the maximum bending moment in the top plate as the fracture position based on the analysis result, wherein the maximum bending moment refers to the moment that produces bending deformation in the rock formation of the top plate as the maximum value of all the moments.

[0008] Optionally, determining the position of the maximum bending moment in the top plate as the fracture position according to the analysis result includes: calculating the position of the maximum bending moment in the top plate using a first formula to obtain the fracture position, wherein the first formula is: x represents the distance between the fracture position and the goaf, β represents the complex part of the general solution of the bending equation, α represents the real part of the general solution of the bending equation, M 0 represents the bending moment, Q 0 represents the beam shear force, r and s represent different intermediate parameters respectively.

[0009] Optionally, before generating a resection strategy for resecting the roof according to the fracture position, the roof resection method of the deep mining roadway also includes: obtaining the roadway width of the deep mining roadway and the width of the coal pillar of the reserved coal pillar, wherein the reserved coal pillar refers to the coal pillar used to support the roof in the deep mining roadway; calculating the sum of the roadway width and the coal pillar width to obtain a width threshold; determining the distance between the fracture position and the goaf as the target distance; when the target distance is zero, obtaining the suspended roof area of ​​the suspended roof in the deep mining roadway, wherein the suspended roof refers to the rock layer suspended above the goaf in the deep mining roadway; when the suspended roof area is greater than the area threshold, determining that the fracture position meets the preset roof resection condition; when the target distance is not zero, if the target distance is within an interval range, determining that the fracture position meets the preset roof resection condition, wherein the interval range is a range composed of the roadway width and the width threshold.

[0010] Optionally, if the target distance is within the interval range, the fracture position is determined to meet the preset top cutting condition, including one of the following: if the target distance is greater than the tunnel width and not greater than the width threshold, the fracture position is above the deep burial mining tunnel, and the fracture position is determined to meet the preset top cutting condition; if the target distance is greater than the width threshold, the fracture position is above the coal seam, and the fracture position is determined to meet the preset top cutting condition.

[0011] Optionally, when the fracture position meets the preset top cutting condition, a cutting strategy for cutting the top plate is generated according to the fracture position, including: when the fracture position meets the preset top cutting condition, determining the cutting parameters for cutting the top plate according to the fracture position, wherein the cutting parameters include: a top cutting height and a top cutting angle, wherein the top cutting height refers to the depth of the rock formation that needs to be cut when the top plate is cut, and the top cutting angle refers to the angle at which the rock formation is cut when the top plate is cut; and determining the top cutting height using a second formula, wherein the second formula is: H Q represents the cutting height, P represents the thickness of the top plate, K A represents the average expansion coefficient of the rock formation; and the top cutting angle is determined by the third formula, wherein the third formula is: θ represents the cutting angle, L represents the cantilever beam length, h g represents the height of the goaf; and the strategy of cutting the top plate according to the top cutting angle and the top cutting height is used as the cutting strategy.

[0012] Optionally, the roof cutting method of the deep mining tunnel also includes: when the target distance is zero and the suspended roof area is not greater than the area threshold, determining that the fracture position does not meet the preset roof cutting condition, wherein the target distance is the distance between the fracture position and the goaf, and the suspended roof area is the area of ​​the suspended roof in the deep mining tunnel; when the target distance is greater than zero and not greater than the tunnel width of the deep mining tunnel, determining that the fracture position does not meet the preset roof cutting condition; when the fracture position does not meet the preset roof cutting condition, continuing to perform stress monitoring and dynamic load monitoring on the roof to obtain a target monitoring result; when it is determined according to the target monitoring result that the roof needs to be cut off, cutting off the roof according to a target cutting strategy, wherein the target cutting strategy is a strategy generated based on the current fracture position of the roof.

[0013] According to another aspect of an embodiment of the present invention, a roof cutting device for a deep-buried mining tunnel is provided, comprising: a monitoring unit, used to perform stress monitoring and dynamic load monitoring on the roof of the deep-buried mining tunnel during mining of the deep-buried mining tunnel to obtain monitoring results, wherein the deep-buried mining tunnel refers to a tunnel with a burial depth greater than a depth threshold; a prediction unit, used to predict the fracture position of the roof using a fracture mechanics model based on the state parameters of the roof when the monitoring result indicates that the current stress of the roof is higher than the stress threshold and / or the current dynamic load of the roof is higher than the dynamic load threshold, wherein , the state parameter represents the current deformation degree of the top plate, the fracture mechanics model refers to a model that uses the principles of engineering mechanics to analyze the mechanical behavior of the fracture of the top plate; a generation unit is used to generate a resection strategy for resecting the top plate according to the fracture position when the fracture position meets the preset resection condition; a first resection unit is used to resect the resection area in the top plate according to the resection strategy so that the top plate reaches a stable state after resection, wherein the stable state refers to a state in which the current stress of the top plate is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold.

[0014] Optionally, the prediction unit includes: an acquisition module, used to analyze the bending moment at each position in the top plate based on the state parameters of the top plate using the fracture mechanics model to obtain an analysis result, wherein the bending moment refers to the moment that produces bending deformation at any position in the rock layer of the top plate; a determination module, used to determine the position of the maximum bending moment in the top plate as the fracture position according to the analysis result, wherein the maximum bending moment refers to the moment that produces bending deformation in the rock layer of the top plate as the maximum value of all the moments.

[0015] Optionally, the determination module includes: an acquisition submodule, configured to calculate the position of the maximum bending moment in the top plate using a first formula to obtain the fracture position, wherein the first formula is: x represents the distance between the fracture position and the goaf, β represents the complex part of the general solution of the bending equation, α represents the real part of the general solution of the bending equation, M 0 represents the bending moment, Q 0 represents the beam shear force, r and s represent different intermediate parameters respectively.

[0016] Optionally, the roof cutting device for the deep-buried mining roadway further includes: a first acquisition unit, used to acquire the roadway width of the deep-buried mining roadway and the width of the coal pillar of the reserved coal pillar before generating a removal strategy for removing the roof according to the fracture position, wherein the reserved coal pillar refers to the coal pillar used to support the roof in the deep-buried mining roadway; a calculation unit, used to calculate the sum of the roadway width and the coal pillar width to obtain a width threshold; a first determination unit, used to determine the distance between the fracture position and the goaf as the target distance; and a second acquisition unit, used to obtain the target distance at the target position. When the target distance is zero, the suspended roof area of ​​the suspended roof in the deep mining tunnel is obtained, wherein the suspended roof refers to the rock layer suspended above the goaf in the deep mining tunnel; the second determination unit is used to determine that the fracture position meets the preset cutting roof condition when the suspended roof area is greater than the area threshold; the third determination unit is used to determine that the fracture position meets the preset cutting roof condition when the target distance is not zero and the target distance is within an interval range, wherein the interval range is a range composed of the tunnel width and the width threshold.

[0017] Optionally, the third determination unit includes one of the following: a first determination module, which is used to determine that if the target distance is greater than the tunnel width and not greater than the width threshold, the fracture position is above the deep mining tunnel, and the fracture position meets the preset top cutting condition; a second determination module, which is used to determine that if the target distance is greater than the width threshold, the fracture position is above the coal seam, and the fracture position meets the preset top cutting condition.

[0018] Optionally, the generating unit comprises: a third determining module, used to determine the cutting parameters for cutting the top plate according to the fracture position when the fracture position meets the preset cutting condition, wherein the cutting parameters include: cutting height and cutting angle, wherein the cutting height refers to the depth of the rock layer to be cut when the top plate is cut, and the cutting angle refers to the angle at which the rock layer is cut when the top plate is cut; and a fourth determining module, used to determine the cutting height using a second formula, wherein the second formula is: H Q represents the cutting height, P represents the thickness of the top plate, K A represents the average expansion coefficient of the rock formation; a fifth determination module, used to determine the top cutting angle using a third formula, wherein the third formula is: θ represents the cutting angle, L represents the cantilever beam length, h g Represents the height of the goaf; a sixth determination module, used to use the strategy of cutting the top plate according to the top cutting angle and the top cutting height as the cutting strategy.

[0019] Optionally, the roof cutting device of the deep mining tunnel also includes: a fourth determination unit, used to determine that the fracture position does not meet the preset roof cutting condition when the target distance is zero and the suspended roof area is not greater than the area threshold, wherein the target distance is the distance between the fracture position and the goaf, and the suspended roof area is the area of ​​the suspended roof in the deep mining tunnel; a fifth determination unit, used to determine that the fracture position does not meet the preset roof cutting condition when the target distance is greater than zero and not greater than the tunnel width of the deep mining tunnel; a third acquisition unit, used to continue stress monitoring and dynamic load monitoring of the roof to obtain a target monitoring result when the fracture position does not meet the preset roof cutting condition; a second resection unit, used to resection the roof according to a target resection strategy when it is determined according to the target monitoring result that the roof needs to be resected, wherein the target resection strategy is a strategy generated based on the current fracture position of the roof.

[0020] According to another aspect of an embodiment of the present invention, a roof cutting system for a deep mining roadway is provided. The roof cutting system for a deep mining roadway uses any of the above-mentioned roof cutting methods for a deep mining roadway.

[0021] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium comprising a stored program, wherein the program executes any one of the above-mentioned methods for cutting the top of a deep mining tunnel.

[0022] According to another aspect of an embodiment of the present invention, a processor is further provided, the processor being used to run a program, wherein when the program is run, any one of the above-mentioned methods for cutting the top of a deep mining tunnel is executed.

[0023] According to another aspect of an embodiment of the present invention, a computer program product is provided, comprising computer instructions, which, when executed by a processor, execute any one of the above-mentioned methods for cutting the top of a deep mining tunnel.

[0024] In an embodiment of the present invention, during the mining process of a deep mining tunnel, stress monitoring and dynamic load monitoring are performed on the roof of the deep mining tunnel to obtain monitoring results, wherein the deep mining tunnel refers to a tunnel with a burial depth greater than a depth threshold; when the monitoring results indicate that the current stress of the roof is higher than the stress threshold and / or the current dynamic load of the roof is higher than the dynamic load threshold, a fracture position where the roof fracture occurs is predicted based on the state parameters of the roof using a fracture mechanics model, wherein the state parameters represent the current deformation degree of the roof, and the fracture mechanics model refers to a model that uses the principles of engineering mechanics to analyze the mechanical behavior of the roof fracture; when the fracture position meets the preset top cutting conditions, a resection strategy for resecting the roof is generated according to the fracture position; the top cutting area in the roof is resected according to the resection strategy, so that the roof reaches a stable state after resection, wherein the stable state refers to a state where the current stress of the roof is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold. Through the above technical scheme, the purpose of monitoring the roof of the deep mining tunnel is achieved to predict the possible fracture position according to the deformation degree of the roof, and analyze whether the roof is needed to avoid potential safety hazards in the deep mining tunnel is achieved. The technical effect of intelligently analyzing the fracture position of the roof in the deep mining tunnel and intelligently analyzing and determining the relevant top cutting parameters when top cutting is needed is achieved, which improves the accuracy of judgment and decision-making on top cutting, and thus solves the technical problem that the judgment on whether to perform top cutting in the coal mining process and the operation method of top cutting usually rely on manual completion in the related technology, resulting in low accuracy and safety hazards. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 It is a hardware structure block diagram of a mobile terminal for a method for cutting the top of a deep mining tunnel according to an embodiment of the present invention;

[0027] Figure 2 is a flow chart of a method for cutting the top of a deep mining tunnel according to an embodiment of the present invention;

[0028] Figure 3 is a flow chart of an optional method for cutting the top of a deep mining tunnel according to an embodiment of the present invention;

[0029] Figure 4 is a schematic diagram of a deep-buried mining tunnel according to an embodiment of the present invention;

[0030] Figure 5 is a schematic diagram of deformation curve parameters of a basic top according to an embodiment of the present invention;

[0031] Figure 6 is a schematic diagram of an optional deep-buried mining tunnel according to an embodiment of the present invention;

[0032] Figure 7 Schematic diagram of a top cutting device for a deep mining tunnel according to an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0035] As introduced in the background technology, in the related art, the judgment of whether to perform top cutting during coal mining and the operation method of top cutting usually rely on manual work, resulting in low accuracy and potential safety hazards. In view of the above defects, a top cutting method and device for deep mining roadway and a computer-readable storage medium are provided in the embodiments of the present invention.

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0037] The method embodiments provided in the embodiments of the present invention can be executed in a mobile terminal, a computer terminal or a similar computing device. Taking running on a mobile terminal as an example, Figure 1 1 is a hardware structure block diagram of a mobile terminal for a method for cutting the top of a deep mining tunnel according to an embodiment of the present invention. Figure 1 As shown, the mobile terminal may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the mobile terminal may also include a transmission device 106 and an input / output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the mobile terminal. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0038] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the method for cutting the top of a deep mining tunnel in the embodiment of the present invention. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the mobile terminal via a network. Examples of the above network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof. The transmission device 106 is used to receive or send data via a network. The specific example of the above network may include a wireless network provided by a communication provider of the mobile terminal. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 may be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0039] According to an embodiment of the present invention, a method embodiment of a method for cutting the top of a deep mining tunnel is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0040] Figure 2 : is a flow chart of a method for cutting the top of a deep mining tunnel according to an embodiment of the present invention. Figure 2 As shown, the method comprises the following steps:

[0041] Step S202, during the mining process of the deep mining tunnel, stress monitoring and dynamic load monitoring are performed on the roof of the deep mining tunnel to obtain monitoring results, wherein the deep mining tunnel refers to a tunnel with a burial depth greater than a depth threshold.

[0042] In this embodiment, during the mining process of the deep mining tunnel, anchor / cable dynamometers, roof delamination meters, laser rangefinders, borehole stress meters, etc. can be used to perform stress monitoring and dynamic load monitoring on the deep mining tunnel, so as to analyze the condition of the roof based on the monitoring results; in addition, when conducting monitoring, the layout of the monitoring station should fully consider the influence of factors such as geological structure, surrounding rock properties and coal pillar size. At the same time, for the working face drift, monitoring should be carried out beyond the range of 200m ahead of the working face (the value here can be adaptively adjusted according to the actual situation without specific restrictions) to avoid interference of the working face mining on the initial stress monitoring and determine whether there are high stress, high dynamic load, etc. on the roof.

[0043] Step S204, when the monitoring results indicate that the current stress of the roof is higher than the stress threshold and / or the current dynamic load of the roof is higher than the dynamic load threshold, a fracture position of the roof is predicted using a fracture mechanics model based on the state parameters of the roof, wherein the state parameters represent the current deformation degree of the roof, and the fracture mechanics model refers to a model that uses the principles of engineering mechanics to analyze the mechanical behavior of the roof fracture.

[0044] Combine the following Figure 3 The above embodiments of the present invention are described in detail. Figure 3 is a flow chart of an optional method for cutting the top of a deep mining tunnel according to an embodiment of the present invention. Figure 3 As shown, when the monitoring results indicate that the top plate currently has high stress (i.e., the current stress of the top plate is higher than the stress threshold), high dynamic load (i.e., the current dynamic load of the top plate is higher than the dynamic load threshold), etc., an "OX" type fracture mechanical model of the top plate can be established. The exact position where the top plate breaks under the extreme span (i.e., the fracture position in the embodiment of the present invention) can be calculated through theoretical analysis to reveal its fracture mechanism and spatial morphology.

[0045] Optionally, when the monitoring results indicate that the current stress of the roof is higher than the stress threshold and / or the current dynamic load of the roof is higher than the dynamic load threshold, the fracture position of the roof is predicted based on the state parameters of the roof using a fracture mechanics model, including: analyzing the bending moment at each position in the roof using a fracture mechanics model based on the state parameters of the roof to obtain an analysis result, wherein the bending moment refers to the moment causing bending deformation at any position in the rock formation of the roof; and determining the position of the maximum bending moment in the roof as the fracture position based on the analysis result, wherein the maximum bending moment refers to the moment causing bending deformation in the rock formation of the roof as the maximum value of all moments.

[0046] Combine the following Figure 4 and Figure 5 The above embodiments of the present invention are described in detail. Figure 4 is a schematic diagram of a deep mining tunnel according to an embodiment of the present invention, Figure 5 Schematic diagram of deformation curve parameters of a basic top according to an embodiment of the present invention.

[0047] like Figure 4As shown in the figure, one or several basic top rock layers in front of the mining area can be regarded as plane strain beams sandwiched by softer rock layers in the strike direction. The length of the beam can be considered to be infinite in the direction of mining face advancement, and it is supported by broken rock blocks in the direction of the goaf. The markings of key blocks A, B and C are usually related to the fracture and collapse mechanism of the top rock layer. They represent rock blocks in different states, as follows: 1) Key block A: usually refers to rock blocks located above the mining roadway that have not yet been broken or have not been completely broken. After the goaf is formed, key block A may be in a suspended state due to stress redistribution, that is, part or all of the rock layer is suspended above the roadway without immediate collapse, but forms a potential unstable rock structure. The existence of critical block A poses a threat to the stability of the tunnel because it may suddenly collapse under the action of external loads (such as subsequent mining, vibration, etc.), causing damage to the tunnel and personnel and equipment; 2) Critical block B: refers to a rock block that has been broken and partially collapsed, usually located above the goaf. During the mining process, due to the mining of coal seams and the release of stress in the overlying strata, key block B may be formed above the goaf. It has been separated from key block A, but in some cases it may still be connected to part of the overlying strata, or form a so-called "bridging" structure. The dynamic behavior of key block B, such as its collapse process and collapse range, directly affects the formation of the goaf and the stability of the overlying strata, and has an important impact on subsequent tunnel safety and roof management; 3) Key block C: It may refer to the rock block located above key block A, or another part of the rock strata related to blocks A and B. In some cases, key block C can represent higher rock strata, which may produce additional stress or deformation under the influence of mining, thereby affecting the stability of the underlying rock strata (such as key blocks A and key blocks B). The existence and status of key block C is one of the important factors in evaluating whether the high roof needs to be cut off, because the stability of the high rock strata will be transmitted to the lower rock strata, affecting the roof management of the mining tunnel. By identifying and analyzing the mechanical behavior and stability of key blocks A, B, and C, a scientific basis can be provided for roof management in coal mines. For example, if key block A is in a suspended roof state and poses a threat to the stability of the mining roadway, it may be necessary to take roof cutting and pressure relief measures to reduce its collapse risk. At the same time, the state of key block B (such as whether an effective collapse zone is formed) can be used to evaluate the effectiveness of roof cutting and pressure relief measures, while the stability of key block C helps to predict the long-term stability of the high roof and whether additional roof management measures are needed.

[0048] In addition, if Figure 5 As shown in the figure, the medium with a certain thickness above and below the basic top can be regarded as elastic medium, and it is considered that it approximately satisfies the Winkler elastic foundation assumption. By analyzing the disturbance caused by the basic top when it breaks, the deformation curve equation of the basic top is as follows: In the formula, r and s have no actual meaning and are intermediate parameters established for the convenience of calculation. β represents the complex part of the general solution of the bending equation, α represents the real part of the general solution of the bending equation, E and I are the elastic modulus and section moment of the basic top rock layer, respectively, and I = bh 3 / 12, k is the cushion coefficient of the coal body below the basic roof. For the sake of simplicity, it is calculated as M 0 =(R S +N / bh 1 )bh 1 2 / 6 is calculated, where Q 0 =qL′+Q′, Q′=L(h 1 γ+q), M 0 represents the beam bending moment corresponding to the coal wall position at the working face, Q 0 represents the beam shear force corresponding to the coal wall position of the working face, R S is the tensile strength of the basic top rock layer, N is the axial force of the beam corresponding to the position of the coal wall at the working face, L is the length of the fractured rock block, L′ is the length of the overhanging part of the fractured rock block, and h 1 is the thickness of the basic top rock layer, h 2 is the thickness of the overlying rock layer on the basic top, Q′ is the deadweight of the fractured rock block and its load, γ is the bulk density of the basic top rock layer, ΔS is the difference in vertical displacement at both ends of the fractured rock, and q is the load concentration of the fractured rock block.

[0049] In the above embodiment of the present invention, determining the position of the maximum bending moment in the top plate as the fracture position according to the analysis result includes: calculating the position of the maximum bending moment in the top plate using a first formula to obtain the fracture position, wherein the first formula is: x represents the distance between the fracture location and the goaf, β represents the complex part of the general solution of the bending equation, α represents the real part of the general solution of the bending equation, M 0 represents the bending moment, Q 0 represents the beam shear force, r and s represent different intermediate parameters respectively.

[0050] Specifically, the fracture position of the basic top can be calculated according to the position of the maximum bending moment M. The calculation formula for the position of the maximum bending moment is as follows: x represents the distance between the fracture location and the goaf.

[0051] Step S206: when the fracture position meets the preset roof cutting condition, a cutting strategy for cutting the roof is generated according to the fracture position.

[0052] In this embodiment, whether the top plate needs to be cut off can be determined by judging in which area the fracture position is specifically located, that is, by judging whether the area where the fracture position is located meets the preset top cutting conditions for cutting off the top plate, and when the judgment result indicates that the fracture position meets the preset top cutting conditions, a cutting strategy for cutting off the top plate is generated according to the fracture position.

[0053] According to the above embodiment of the present invention, before generating the resection strategy in the above step S206, it is also necessary to determine whether the fracture position meets the preset top cutting condition, that is, before generating the resection strategy for resectioning the roof according to the fracture position, the top cutting method of the deep burial mining roadway also includes: obtaining the roadway width of the deep burial mining roadway and the coal pillar width of the reserved coal pillar, wherein the reserved coal pillar refers to the coal pillar used to support the roof in the deep burial mining roadway; calculating the sum of the roadway width and the coal pillar width to obtain the width threshold; determining the distance between the fracture position and the goaf as the target distance; when the target distance is zero, obtaining the suspended roof area of ​​the suspended roof in the deep burial mining roadway, wherein the suspended roof refers to the rock layer suspended above the goaf in the deep burial mining roadway; when the suspended roof area is greater than the area threshold, determining that the fracture position meets the preset top cutting condition; when the target distance is not zero, if the target distance is within the interval range, determining that the fracture position meets the preset top cutting condition, wherein the interval range is a range composed of the roadway width and the width threshold.

[0054] Combine the following Figure 6 The above embodiments of the present invention are described in detail. Figure 6 It is a schematic diagram of an optional deep-buried mining tunnel according to an embodiment of the present invention.

[0055] As above Figure 3 ,superior Figure 4 and Figure 6 As shown, when x 0 = 0, the roof breaking position (i.e. fracture position) is located above the goaf, where x 0 and x both represent the distance between the fracture position of the roof and the goaf. When the distance is zero, it is represented by x. 0 To indicate that when x 0 =0, the basic roof fracture line is located in the goaf, the basic roof of the roadway is disconnected from the basic roof of the goaf, the rock strata activity in the goaf has the least disturbance on the overburden structure of the roadway, the deformation of the surrounding rock of the roadway is the smallest, and the roof collapses naturally; however, if the key block A is hard and complete and there is a suspended roof for a distance in the goaf, and the key block B breaks in the goaf, at this time, the pressure of the high-level rock strata on the basic roof is transmitted from the basic roof to the top of the coal pillar, and the bearing capacity of the coal pillar is too large, and the roof needs to be cut off. That is, it is necessary to judge whether the suspended roof area above the goaf exceeds the predetermined area threshold. If it exceeds, it needs to be cut off. If not, the roof collapses naturally.

[0056] When the distance between the fracture position of the roof and the goaf is non-zero, the area where the fracture position is located can be determined by judging the range of the interval where the distance is located, so as to judge whether the fracture position meets the preset roof cutting condition.

[0057] In the above embodiments of the present invention, if the target distance is within the interval range, it is determined that the fracture position meets the preset roof cutting condition, including one of the following: if the target distance is greater than the roadway width and not greater than the width threshold, the fracture position is above the deep mining roadway, and it is determined that the fracture position meets the preset roof cutting condition; if the target distance is greater than the width threshold, the fracture position is above the coal rib, and it is determined that the fracture position meets the preset roof cutting condition.

[0058] Specifically, as shown above Figure 3 As shown, when 0 < x < b, the basic roof fracture line (also referring to the fracture position) is above the coal pillar, disturbing the coal pillar and causing stress concentration. The deformation of the surrounding rock of the coal pillar side in the goaf increases, the solid coal rib is relatively stable, the deformation of the roadway surrounding rock is small, and the roof can collapse naturally; when b < x < a + b, the basic roof fracture line is above the roadway, and the coal pillar is most severely damaged by the superposition of static and dynamic loads, the deformation of the roadway surrounding rock is the largest, and large-scale tensile damage appears in the roadway surrounding rock, and roof cutting treatment is required for the roof; when x > a + b, the basic roof fracture position is above the solid coal rib, and the basic roof will inevitably produce a secondary fracture on the goaf side, and the overlying strata form a "reverse step" shape, increasing the coal pillar load and the roadway deformation is large, and roof cutting treatment is required for the roof; generally speaking, when the distance x is greater than the width b of the mining roadway, it can be considered that the fracture position meets the preset roof cutting condition, and a corresponding roof cutting strategy needs to be generated.

[0059] According to the above embodiments of the present invention, in the above step S206, when the fracture position meets the preset roof cutting condition, a cutting strategy for cutting the roof is generated according to the fracture position, including: when the fracture position meets the preset roof cutting condition, cutting parameters for cutting the roof are determined according to the fracture position, where the cutting parameters include: the roof cutting height and the roof cutting angle, the roof cutting height refers to the depth of the rock layer that needs to be cut when cutting the roof, and the roof cutting angle refers to the angle at which the rock layer is cut when cutting the roof; the roof cutting height is determined by using the second formula, where the second formula is: H Q represents the roof cutting height, P represents the thickness of the roof, and K A represents the average swelling coefficient of the rock layer; the roof cutting angle is determined by using the third formula, where the third formula is: θ represents the roof cutting angle, L represents the length of the cantilever beam, and h gIt indicates the height of the goaf; the strategy of cutting the roof according to the cutting angle and cutting height is used as the cutting strategy.

[0060] Specifically, for the roof area determined to be in need of top cutting treatment, scientific top cutting technical means are adopted for intervention treatment, the roof structure is optimized, and the stability and safety of the roadway are enhanced; when determining the removal strategy for the roof according to the fracture position of the roof, the following aspects are mainly considered: 1) Top cutting and pressure relief timing: In the upper section working face roadway, at the roof position, advance pre-cutting is carried out at a predetermined angle, drilling and charging are arranged in advance on the roadway roof, the roof hanging structure is cut off, and the rock layer is cut off at the pre-crack surface. After the working face is pushed over, the roof slides down to the goaf along the pre-cut seam surface under the action of periodic pressure and deadweight of the roof; 2) Top cutting height design: Under the condition of composite roof, when the top cutting height is not greater than the sum of the thickness of the direct roof and the basic roof, the actual selected blasting top cutting height should be the sum of the thickness of the direct roof and the basic roof; and when the top cutting height is not less than the sum of the thickness of the direct roof and the basic roof, the actual selected blasting top cutting height should be the calculated top cutting height; the top cutting height calculation formula can be expressed as: H Q represents the top cutting height, P represents the thickness of the top plate, K A Indicates the average expansion coefficient of the rock formation; 3) Top cutting angle design: Generally, the top cutting drill hole maintains a small angle with the vertical line of the roof to ensure the top cutting effect. The calculation formula of the top cutting angle (the angle between the top cutting drill hole and the vertical line of the roof) can be expressed as: θ represents the cutting angle, L represents the cantilever beam length, h g It represents the height of the goaf; the strategy of cutting the roof according to the timing, cutting angle and cutting height obtained above can be used as the cutting strategy.

[0061] Step S208, cutting off the top cutting area in the top plate according to the cutting off strategy, so that the top plate after cutting off reaches a stable state, wherein the stable state refers to a state in which the current stress of the top plate is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold.

[0062] In this embodiment, after obtaining a top cutting strategy for cutting off the roof according to the above steps, the roof can be cut off according to the top cutting strategy so that the top plate after cutting reaches a stable state, that is, the current stress of the top plate is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold, thereby ensuring the safety of the deep mining tunnel.

[0063] In an alternative embodiment of the present invention, the roof cutting method for the deep-buried mining roadway further includes: when the target distance is zero and the hanging roof area is not greater than the area threshold, it is determined that the fracture position does not meet the preset roof cutting condition, where the target distance is the distance between the fracture position and the goaf, and the hanging roof area is the area of the hanging roof in the deep-buried mining roadway; when the target distance is greater than zero and not greater than the roadway width of the deep-buried mining roadway, it is determined that the fracture position does not meet the preset roof cutting condition; when the fracture position does not meet the preset roof cutting condition, continue to perform stress monitoring and dynamic load monitoring on the roof to obtain the target monitoring result; when it is determined according to the target monitoring result that the roof needs to be cut, cut the roof according to the target cutting strategy, where the target cutting strategy is a strategy generated based on the current fracture position of the roof.

[0064] Specifically, when it is determined according to the judgment in the above steps that the fracture position of the roof does not meet the preset roof cutting condition, that is, x 0 = 0 and the hanging roof area above the goaf does not exceed the area threshold, or 0 < x < b, that is, when the fracture position is above the coal pillar, the roof can be waited to collapse naturally; at the same time, it is also necessary to continue to monitor the roof. If it is monitored that a new fracture position may appear, the new fracture position can be re-analyzed according to the technical solution provided in the above embodiment of the present invention to generate the corresponding roof cutting strategy and process the roof or continue to wait for the roof to collapse naturally.

[0065] It can be seen from the above that, through the technical solution provided by the above embodiment of the present invention, in the process of mining the deep mining tunnel, the roof of the deep mining tunnel can be subjected to stress monitoring and dynamic load monitoring to obtain monitoring results, wherein the deep mining tunnel refers to a tunnel with a burial depth greater than a depth threshold; when the monitoring results indicate that the current stress of the roof is higher than the stress threshold and / or the current dynamic load of the roof is higher than the dynamic load threshold, the fracture position of the roof is predicted based on the state parameters of the roof using a fracture mechanics model, wherein the state parameters indicate the current deformation degree of the roof, and the fracture mechanics model refers to a model that uses the principles of engineering mechanics to analyze the mechanical behavior of the roof fracture; when the fracture position meets the preset top cutting conditions, the fracture position is predicted based on the fracture mechanics model. A cutting strategy for cutting the roof is generated at the fracture position; the cutting area in the roof is cut according to the cutting strategy to make the roof reach a stable state after cutting, wherein the stable state refers to a state in which the current stress of the roof is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold. The purpose of monitoring the roof of the deep mining tunnel to predict the possible fracture position according to the deformation degree of the roof and analyzing whether the roof is needed to avoid potential safety hazards in the deep mining tunnel is achieved. The technical effect of intelligently analyzing the fracture position of the roof in the deep mining tunnel and intelligently analyzing and determining the relevant cutting parameters when the roof is needed is achieved, thereby improving the accuracy of judgment and decision-making on the cutting process.

[0066] Therefore, the technical solution provided by the above-mentioned embodiment of the present invention solves the technical problem in the related art that the judgment on whether to perform top cutting during coal mining and the operation method of top cutting usually rely on manual completion, resulting in low accuracy and safety hazards.

[0067] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0068] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0069] According to an embodiment of the present invention, a roof cutting device for a deep mining roadway is provided for implementing the above-mentioned roof cutting method for a deep mining roadway. Figure 7 Schematic diagram of a top cutting device for a deep mining tunnel according to an embodiment of the present invention. Figure 7 As shown, the device comprises: a monitoring unit 71, a prediction unit 73, a generation unit 75 and a first cutting unit 77. The top cutting device for deep mining roadway is described in detail below.

[0070] The monitoring unit 71 is used to perform stress monitoring and dynamic load monitoring on the roof of the deep mining tunnel during the mining process to obtain monitoring results, wherein the deep mining tunnel refers to a tunnel with a burial depth greater than a depth threshold.

[0071] The prediction unit 73 is used to predict the fracture position of the roof plate by using a fracture mechanics model based on the state parameters of the roof when the monitoring results indicate that the current stress of the roof is higher than the stress threshold and / or the current dynamic load of the roof is higher than the dynamic load threshold, wherein the state parameters represent the current deformation degree of the roof and the fracture mechanics model refers to a model that uses the principles of engineering mechanics to analyze the mechanical behavior of the roof fracture.

[0072] The generating unit 75 is used to generate a cutting strategy for cutting the top plate according to the fracture position when the fracture position meets the preset cutting condition.

[0073] The first cutting unit 77 is used to cut the cutting area in the top plate according to the cutting strategy so that the top plate reaches a stable state after cutting, wherein the stable state refers to a state in which the current stress of the top plate is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold.

[0074] It should be noted here that the above-mentioned monitoring unit 71, prediction unit 73, generation unit 75 and first resection unit 77 correspond to steps S202 to S208 in the above-mentioned embodiments, and the four units and the corresponding steps implement the same instances and application scenarios, but are not limited to the contents disclosed in the above-mentioned embodiments.

[0075] As can be seen from the above, in the scheme recorded in the above-mentioned embodiment of the present invention, the monitoring unit can be used to perform stress monitoring and dynamic load monitoring on the roof of the deep mining tunnel during the mining process of the deep mining tunnel to obtain the monitoring results, wherein the deep mining tunnel refers to a tunnel with a burial depth greater than the depth threshold; then, the prediction unit is used to predict the fracture position of the roof based on the state parameters of the roof using the fracture mechanics model when the monitoring results indicate that the current stress of the roof is higher than the stress threshold and / or the current dynamic load of the roof is higher than the dynamic load threshold, wherein the state parameters indicate the current deformation degree of the roof, and the fracture mechanics model refers to a model that uses the principles of engineering mechanics to analyze the mechanical behavior of the roof fracture; then, the generation unit is used to generate the prediction results when the fracture position meets the preset top cutting conditions Under the present invention, a cutting strategy for cutting the roof is generated according to the fracture position; finally, the first cutting unit is used to cut the cutting area in the roof according to the cutting strategy, so that the roof after cutting reaches a stable state, wherein the stable state refers to the state that the current stress of the roof is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold. The purpose of monitoring the roof of the deep mining roadway to predict the possible fracture position according to the deformation degree of the roof and analyzing whether the roof is needed to avoid potential safety hazards in the deep mining roadway is achieved. The technical effect of intelligently analyzing the fracture position of the roof in the deep mining roadway and intelligently analyzing and determining the relevant cutting parameters when the roof is needed is achieved, thereby improving the accuracy of judgment and decision-making on the cutting treatment.

[0076] Therefore, the technical solution provided by the above-mentioned embodiment of the present invention solves the technical problem in the related art that the judgment on whether to perform top cutting during coal mining and the operation method of top cutting usually rely on manual completion, resulting in low accuracy and safety hazards.

[0077] In an optional embodiment, the prediction unit includes: an acquisition module, which is used to analyze the bending moment at each position in the top plate based on the state parameters of the top plate using a fracture mechanics model to obtain an analysis result, wherein the bending moment refers to the moment that produces bending deformation at any position in the rock layer of the top plate; a determination module, which is used to determine the position where the maximum bending moment in the top plate is located as the fracture position according to the analysis result, wherein the maximum bending moment refers to the moment that produces bending deformation in the rock layer of the top plate as the maximum value of all moments.

[0078] In an optional embodiment, the determination module includes: an acquisition submodule, which is used to calculate the position of the maximum bending moment in the top plate using a first formula to obtain the fracture position, wherein the first formula is: x represents the distance between the fracture location and the goaf, β represents the complex part of the general solution of the bending equation, α represents the real part of the general solution of the bending equation, M0 represents the bending moment, Q 0 represents the beam shear force, r and s represent different intermediate parameters respectively.

[0079] In an optional embodiment, the roof cutting device of the deep burial mining roadway also includes: a first acquisition unit, which is used to acquire the roadway width of the deep burial mining roadway and the coal pillar width of the reserved coal pillar before generating a resection strategy for resecting the roof according to the fracture position, wherein the reserved coal pillar refers to the coal pillar used to support the roof in the deep burial mining roadway; a calculation unit, which is used to calculate the sum of the roadway width and the coal pillar width to obtain a width threshold; a first determination unit, which is used to determine that the distance between the fracture position and the goaf is the target distance; a second acquisition unit, which is used to acquire the suspended roof area of ​​the suspended roof in the deep burial mining roadway when the target distance is zero, wherein the suspended roof refers to the rock layer suspended above the goaf in the deep burial mining roadway; a second determination unit, which is used to determine that the fracture position meets the preset roof cutting condition when the suspended roof area is greater than the area threshold; a third determination unit, which is used to determine that the fracture position meets the preset roof cutting condition when the target distance is not zero and the target distance is within an interval range, wherein the interval range is a range composed of the roadway width and the width threshold.

[0080] In an optional embodiment, the third determination unit includes one of the following: a first determination module, which is used to determine that if the target distance is greater than the tunnel width and not greater than the width threshold, the fracture position is above the deep mining tunnel, and the fracture position meets the preset top cutting condition; a second determination module, which is used to determine that if the target distance is greater than the width threshold, the fracture position is above the coal seam, and the fracture position meets the preset top cutting condition.

[0081] In an optional embodiment, the generating unit includes: a third determining module, which is used to determine the cutting parameters for cutting the top plate according to the fracture position when the fracture position meets the preset cutting condition, wherein the cutting parameters include: cutting height and cutting angle, the cutting height refers to the depth of the rock layer that needs to be cut when the top plate is cut, and the cutting angle refers to the angle of the rock layer when the top plate is cut; a fourth determining module, which is used to determine the cutting height using the second formula, wherein the second formula is: H Q represents the top cutting height, P represents the thickness of the top plate, K A represents the average expansion coefficient of the rock formation; a fifth determination module is used to determine the top cutting angle using the third formula, wherein the third formula is: θ represents the cutting angle, L represents the cantilever beam length, h g Indicates the height of the goaf; a sixth determination module, used to use the strategy of cutting the roof according to the top cutting angle and the top cutting height as the cutting strategy.

[0082] In an optional embodiment, the top cutting device of the deep mining tunnel also includes: a fourth determination unit, which is used to determine that the fracture position does not meet the preset top cutting conditions when the target distance is zero and the suspended roof area is not greater than the area threshold, wherein the target distance is the distance between the fracture position and the goaf, and the suspended roof area is the area of ​​the suspended roof in the deep mining tunnel; a fifth determination unit, which is used to determine that the fracture position does not meet the preset top cutting conditions when the target distance is greater than zero and not greater than the tunnel width of the deep mining tunnel; a third acquisition unit, which is used to continue stress monitoring and dynamic load monitoring of the roof to obtain target monitoring results when the fracture position does not meet the preset top cutting conditions; a second resection unit, which is used to resection the roof according to the target resection strategy when it is determined that the roof needs to be resected according to the target monitoring results, wherein the target resection strategy is a strategy generated based on the current fracture position of the roof.

[0083] According to another aspect of an embodiment of the present invention, a roof cutting system for a deep mining roadway is provided. The roof cutting system for a deep mining roadway uses any of the above-mentioned roof cutting methods for a deep mining roadway.

[0084] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium comprising a stored program, wherein the program executes any one of the above-mentioned methods for cutting the top of a deep mining tunnel.

[0085] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided, the computer-readable storage medium including a stored program, wherein the program executes any one of the above-mentioned methods for cutting the top of a deep mining tunnel.

[0086] Optionally, in this embodiment, the computer-readable storage medium may be located in any one of the computer terminals in a computer terminal group in a computer network, or in any one of the communication devices in a communication device group.

[0087] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: in the process of mining a deep mining tunnel, performing stress monitoring and dynamic load monitoring on the roof of the deep mining tunnel to obtain monitoring results, wherein the deep mining tunnel refers to a tunnel with a burial depth greater than a depth threshold; when the monitoring results indicate that the current stress of the roof is higher than the stress threshold and / or the current dynamic load of the roof is higher than the dynamic load threshold, predicting the fracture position of the roof based on the state parameters of the roof using a fracture mechanics model, wherein the state parameters represent the current deformation degree of the roof, and the fracture mechanics model refers to a model that analyzes the mechanical behavior of the roof fracture using the principles of engineering mechanics; when the fracture position meets the preset top cutting condition, generating a resection strategy for resecting the roof according to the fracture position; and resecting the top cutting area in the roof according to the resection strategy so that the roof reaches a stable state after resection, wherein the stable state refers to a state in which the current stress of the roof is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold.

[0088] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for executing the following steps: analyzing the bending moment at each position in the top plate using a fracture mechanics model based on the state parameters of the top plate to obtain an analysis result, wherein the bending moment refers to the moment that produces bending deformation at any position in the rock formation of the top plate; determining, based on the analysis result, the position where the maximum bending moment in the top plate is located as the fracture position, wherein the maximum bending moment refers to the moment that produces bending deformation in the rock formation of the top plate as the maximum value of all moments.

[0089] Optionally, in this embodiment, the computer-readable storage medium is configured to store a program code for executing the following steps: using a first formula to calculate the position of the maximum bending moment in the top plate to obtain the fracture position, wherein the first formula is: x represents the distance between the fracture location and the goaf, β represents the complex part of the general solution of the bending equation, α represents the real part of the general solution of the bending equation, M 0 represents the bending moment, Q 0 represents the beam shear force, r and s represent different intermediate parameters respectively.

[0090] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: obtaining the tunnel width of a deep burial mining tunnel and the width of a coal pillar where a coal pillar is left, wherein the coal pillar left refers to a coal pillar used to support the roof in a deep burial mining tunnel; calculating the sum of the tunnel width and the coal pillar width to obtain a width threshold; determining the distance between the fracture position and the goaf as the target distance; when the target distance is zero, obtaining the suspended roof area of ​​the suspended roof in the deep burial mining tunnel, wherein the suspended roof refers to the rock layer suspended above the goaf in the deep burial mining tunnel; when the suspended roof area is greater than the area threshold, determining that the fracture position meets the preset top cutting condition; when the target distance is not zero, if the target distance is within an interval range, determining that the fracture position meets the preset top cutting condition, wherein the interval range is a range composed of the tunnel width and the width threshold.

[0091] Optionally, in this embodiment, the computer-readable storage medium is configured to store program codes for executing the following steps: if the target distance is greater than the tunnel width and not greater than a width threshold, the fracture position is above the deep mining tunnel, and it is determined that the fracture position meets the preset top cutting conditions; if the target distance is greater than the width threshold, the fracture position is above the coal seam, and it is determined that the fracture position meets the preset top cutting conditions.

[0092] Optionally, in this embodiment, the computer-readable storage medium is configured to store a program code for executing the following steps: when the fracture position meets the preset top cutting condition, determining the cutting parameters for cutting the top plate according to the fracture position, wherein the cutting parameters include: a top cutting height and a top cutting angle, wherein the top cutting height refers to the depth of the rock layer that needs to be cut when the top plate is cut, and the top cutting angle refers to the angle at which the rock layer is cut when the top plate is cut; and determining the top cutting height using a second formula, wherein the second formula is: H Q represents the top cutting height, P represents the thickness of the top plate, K A represents the average expansion coefficient of the rock formation; the top cutting angle is determined by the third formula, where the third formula is: θ represents the cutting angle, L represents the cantilever beam length, h g It indicates the height of the goaf; the strategy of cutting the roof according to the cutting angle and cutting height is used as the cutting strategy.

[0093] Optionally, in this embodiment, the computer-readable storage medium is configured to store program code for executing the following steps: when the target distance is zero and the hanging roof area is not greater than an area threshold, determining that the fracture position does not meet the preset top cutting condition, wherein the target distance is the distance between the fracture position and the goaf, and the hanging roof area is the area of ​​the hanging roof in the deep burial mining tunnel; when the target distance is greater than zero and not greater than the tunnel width of the deep burial mining tunnel, determining that the fracture position does not meet the preset top cutting condition; when the fracture position does not meet the preset top cutting condition, continuing to perform stress monitoring and dynamic load monitoring on the roof to obtain target monitoring results; when it is determined according to the target monitoring results that the roof needs to be resected, resecting the roof according to the target resection strategy, wherein the target resection strategy is a strategy generated based on the current fracture position of the roof.

[0094] According to another aspect of an embodiment of the present invention, a processor is further provided, and the processor is used to run a program, wherein when the program is run, any one of the above-mentioned methods for cutting the top of a deep mining tunnel is executed.

[0095] According to another aspect of an embodiment of the present invention, a computer program product is provided, comprising computer instructions, which, when executed by a processor, execute any one of the above-mentioned methods for cutting the top of a deep mining tunnel.

[0096] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0097] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0098] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0099] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0100] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0101] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0102] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for cutting the top of a deep mining tunnel, characterized in that: include: During the mining process of a deep mining roadway, stress monitoring and dynamic load monitoring are performed on the roof of the deep mining roadway to obtain monitoring results, wherein the deep mining roadway refers to a roadway with a burial depth greater than a depth threshold; When the monitoring result indicates that the current stress of the roof is higher than the stress threshold and / or the current dynamic load of the roof is higher than the dynamic load threshold, a fracture position of the roof is predicted based on the state parameters of the roof using a fracture mechanics model, wherein the state parameters represent the current deformation degree of the roof, and the fracture mechanics model refers to a model for analyzing the mechanical behavior of the roof fracture using the principles of engineering mechanics; When the fracture position meets the preset roof cutting condition, generating a cutting strategy for cutting the roof according to the fracture position; The top cutting area in the top plate is cut off according to the cutting strategy so that the top plate reaches a stable state after cutting off, wherein the stable state refers to a state in which the current stress of the top plate is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold.

2. The method for cutting the top of a deep mining tunnel according to claim 1, characterized in that: When the monitoring result indicates that the current stress of the roof is higher than the stress threshold and / or the current dynamic load of the roof is higher than the dynamic load threshold, predicting the fracture position of the roof by using a fracture mechanics model based on the state parameters of the roof, includes: Based on the state parameters of the roof, the bending moment at each position in the roof is analyzed using the fracture mechanics model to obtain an analysis result, wherein the bending moment refers to the moment that generates bending deformation at any position in the rock layer of the roof; The position of the maximum bending moment in the top plate is determined as the fracture position according to the analysis result, wherein the maximum bending moment refers to the moment that produces bending deformation in the rock layer of the top plate as the maximum value of all the moments.

3. The method for cutting the top of a deep mining tunnel according to claim 2, characterized in that: Determining the position of the maximum bending moment in the top plate as the fracture position according to the analysis result includes: The position of the maximum bending moment in the top plate is calculated using a first formula to obtain the fracture position, wherein the first formula is: x represents the distance between the fracture position and the goaf, β represents the complex part of the general solution in the bending equation, α represents the real part of the general solution in the bending equation, M0 represents the bending moment, Q0 represents the beam shear force, and r and s represent different intermediate parameters respectively.

4. The method for cutting the top of a deep mining tunnel according to claim 1, characterized in that: Before generating a cutting strategy for cutting the top plate according to the fracture position, the method further includes: Obtaining the width of the deep-buried mining roadway and the width of the coal pillars with a reserved coal pillar, wherein the reserved coal pillar refers to the coal pillars in the deep-buried mining roadway used to support the roof; Calculating the sum of the roadway width and the coal pillar width to obtain a width threshold; Determine the distance between the fracture position and the goaf as the target distance; When the target distance is zero, obtaining the suspended roof area of ​​the suspended roof in the deep-buried mining tunnel, wherein the suspended roof refers to the rock layer suspended above the goaf in the deep-buried mining tunnel; When the overhanging top area is greater than the area threshold, determining that the fracture position meets the preset top cutting condition; In the case where the target distance is not zero, if the target distance is within an interval range, it is determined that the fracture position meets the preset top cutting condition, wherein the interval range is a range consisting of the lane width and the width threshold.

5. The method for cutting the top of a deep mining tunnel according to claim 4, characterized in that: If the target distance is within the interval, determining that the fracture position meets the preset top cutting condition includes one of the following: If the target distance is greater than the tunnel width and not greater than the width threshold, the fracture position is above the deep mining tunnel, and it is determined that the fracture position meets the preset top cutting condition; If the target distance is greater than the width threshold, the fracture position is above the coal seam, and it is determined that the fracture position meets the preset top cutting condition.

6. The method for cutting the top of a deep mining tunnel according to claim 1, characterized in that: When the fracture position meets the preset roof cutting condition, a cutting strategy for cutting the roof is generated according to the fracture position, including: In the case where the fracture position meets the preset top cutting condition, the cutting parameters for cutting the top plate are determined according to the fracture position, wherein the cutting parameters include: a top cutting height and a top cutting angle, wherein the top cutting height refers to the depth of the rock layer to be cut when the top plate is cut, and the top cutting angle refers to the angle at which the rock layer is cut when the top plate is cut; The top cutting height is determined by using a second formula, wherein the second formula is: H Q represents the cutting height, P represents the thickness of the top plate, K A It indicates the average expansion coefficient of rock formation; The tangent angle is determined by using a third formula, wherein the third formula is: θ represents the cutting angle, L represents the cantilever beam length, h g Indicates the height of the goaf; A strategy of cutting the top plate according to the top cutting angle and the top cutting height is used as the cutting strategy.

7. The method for cutting the top of a deep mining tunnel according to claim 1, characterized in that: Also includes: When the target distance is zero and the hanging roof area is not greater than the area threshold, it is determined that the fracture position does not meet the preset roof cutting condition, wherein the target distance is the distance between the fracture position and the goaf, and the hanging roof area is the area of ​​the hanging roof in the deep mining tunnel; When the target distance is greater than zero and not greater than the width of the deep-buried mining roadway, it is determined that the fracture position does not meet the preset top cutting condition; When the fracture position does not meet the preset top cutting condition, continue to perform stress monitoring and dynamic load monitoring on the top plate to obtain a target monitoring result; When it is determined according to the target monitoring result that the top plate needs to be resected, the top plate is resected according to a target resection strategy, wherein the target resection strategy is a strategy generated based on the current fracture position of the top plate.

8. A top cutting device for deep mining tunnels, characterized in that: include: A monitoring unit is used to perform stress monitoring and dynamic load monitoring on the roof of a deep-buried mining roadway during mining of the deep-buried mining roadway to obtain monitoring results, wherein the deep-buried mining roadway refers to a roadway with a burial depth greater than a depth threshold; a prediction unit, configured to predict a fracture position of the roof plate by using a fracture mechanics model based on a state parameter of the roof plate when the monitoring result indicates that the current stress of the roof plate is higher than a stress threshold and / or the current dynamic load of the roof plate is higher than a dynamic load threshold, wherein the state parameter indicates the current deformation degree of the roof plate, and the fracture mechanics model refers to a model for analyzing the mechanical behavior of the roof plate fracture by using the principle of engineering mechanics; A generating unit, configured to generate a cutting strategy for cutting the top plate according to the fracture position when the fracture position meets a preset cutting condition; The first cutting unit is used to cut the cutting area in the top plate according to the cutting strategy so that the top plate reaches a stable state after cutting, wherein the stable state refers to a state in which the current stress of the top plate is not higher than the stress threshold and the current dynamic load is not higher than the dynamic load threshold.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the method for cutting the top of a deep mining tunnel as described in any one of claims 1 to 7.

10. A computer program product comprising computer instructions, characterized in that: When the computer instructions are executed by the processor, the method for cutting the top of a deep mining tunnel as described in any one of claims 1 to 7 is performed.

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